Heat recovery ventilation is designed to lessen energy cost while infusing your home with cleaner, warmer air. How does it work? While moving stale indoor air outside, the heat recovery system extracts heat energy from exhaust air and transfers it to the incoming fresh air from outdoors, saving you money and adding comfort in colder climates. Plus the heating mechanism can be bypassed in warmer weather. With trusted brands including Broan, you will quite literally breathe easier.